Industrial production, U.S., 1860-1970, annual        
    .9 
    .9 
    .9 
   1.0 
   1.0 
   1.0 
   1.2 
   1.3 
   1.3 
   1.4 
   1.5 
   1.5 
   1.8 
   1.8 
   1.7 
   1.7 
   1.7 
   1.8 
   1.9 
   2.2 
   2.5 
   2.8 
   3.0 
   3.0 
   2.9 
   2.9 
   3.5 
   3.7 
   3.8 
   4.1 
   4.4 
   4.5 
   4.8 
   4.3 
   4.2 
   4.9 
   4.6 
   4.9 
   5.6 
   6.1 
   6.3 
   7.1 
   7.9 
   8.1 
   7.8 
   9.2 
   9.8 
  10.0 
   8.5 
  10.0 
  10.6 
  10.2 
  11.7 
  12.5 
  11.7 
  13.6 
  16.1 
  16.2 
  16.0 
  14.1 
  14.8 
  11.4 
  14.5 
  17.3 
  16.2 
  17.8 
  18.9 
  18.9 
  19.6 
  21.8 
  18.1 
  15.0 
  11.7 
  13.8 
  15.1 
  17.4 
  20.6 
  22.5 
  17.8 
  21.8 
  25.5 
  31.8 
  36.6 
  44.7 
  48.3 
  41.3 
  35.2 
  39.4 
  41.0 
  38.8 
  44.9 
  48.7 
  50.6 
  54.8 
  51.8 
  58.4 
  61.0 
  61.8 
  57.8 
  64.7 
  66.2 
  66.6 
  72.1 
  76.5 
  81.8 
  89.2 
  98.0 
 100.0 
 105.8 
 110.7 
 106.7 
